Chemistry Basics 1st week

Which of the following is a physical change?

• Rusting of iron

• Melting of ice

• Burning of wood

• Baking a cake

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DOK Level 2: Skill/Concept

What is the chemical formula for water?

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DOK Level 2: Skill/Concept

Convert 500 milliliters to liters.

• 0.05 liters

• 0.5 liters

• 5 liters

• 50 liters

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DOK Level 2: Skill/Concept

Which of the following is a mixture?

• Pure water

• Salt

• Air

• Carbon dioxide

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Which technique is used to separate a mixture of sand and salt?

• Filtration

• Distillation

• Chromatography

• Evaporation

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How many valence electrons does oxygen have?

• 2

• 4

• 6

• 8

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DOK Level 2: Skill/Concept

Which of the following is an example of a homogeneous mixture?

• Salad

• Sand and water

• Saltwater

• Oil and water

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DOK Level 2: Skill/Concept

What is the mass number of an atom with 6 protons and 6 neutrons?

• 6

• 12

• 18

• 24

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DOK Level 2: Skill/Concept

How many valence electrons does sodium (Na) have?

• 1

• 2

• 3

• 4

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DOK Level 2: Skill/Concept

Which of the following is a chemical change?

• Dissolving sugar in water

• Cutting paper

• Burning a candle

• Melting butter

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DOK Level 2: Skill/Concept